Water Treatment

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Across
  1. 2. Dirty water runs down here in our houses.
  2. 7. The spread of this can be stopped by treating waste water.
  3. 9. The 'good' stuff is used to clean the water at the last stage.
  4. 10. Where you can find a network of pipes and sewers.
Down
  1. 1. Dirty water also runs down here in our houses.
  2. 3. Rain water from the roads, roofs and gardens is known as...?
  3. 4. Dirty water is flushed down here in our houses.
  4. 5. Smaller particles settle as this.
  5. 6. Anything that flows through a sewer is known as..?
  6. 8. Carry dirty water to treatment works.